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Bubble deck slab (voided slabs)

 
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kajal.chopra
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Joined: 26 Jan 2003
Posts: 102

PostPosted: Mon May 19, 2014 4:32 am    Post subject: Bubble deck slab (voided slabs) Reply with quote

Hi,

Does anyone have experience in the analysis and design of bubble deck slabs / voided floor systems?

I'm looking to gather some information for the analysis and design of such floor systems.

Can anyone please help in this regard?
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madhav1bhide
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Joined: 21 Feb 2010
Posts: 20

PostPosted: Tue May 20, 2014 4:37 am    Post subject: Re: Bubble deck slab (voided slabs) Reply with quote

Long back I had designed a similar slab (size 80 feet x 40 feet )mosque in dubai.. I had used plastic moulds (in the shape of ice cubes and the slab after casting looked like an inverted ice trave in our freezer) the british company which supplied the moulds had some design tables. using the parameters of load and span i had done that. it was called 'waffle slab' at that time (way back in 1983. now i have no records.. you can try and search the data on internate


kajal.chopra wrote:
Hi,

Does anyone have experience in the analysis and design of bubble deck slabs / voided floor systems?

I'm looking to gather some information for the analysis and design of such floor systems.

Can anyone please help in this regard?
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madhav1bhide
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Joined: 21 Feb 2010
Posts: 20

PostPosted: Tue May 20, 2014 4:42 am    Post subject: Re: Bubble deck slab (voided slabs) Reply with quote

read this
http://www.uap-bd.edu/ce/anam/Anam_files/Design%20of%20Waffle%20Slab.pdf

and this
http://www.bhrc.ac.ir/portal/Portals/2/pdf/asian%20jornal/July%202005/183.pdf

and this
http://www.ipublishing.co.in/ijcserarticles/ten/articles/volone/EIJCSE2054.pdf

kajal.chopra wrote:
Hi,

Does anyone have experience in the analysis and design of bubble deck slabs / voided floor systems?

I'm looking to gather some information for the analysis and design of such floor systems.

Can anyone please help in this regard?
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madhav1bhide
SEFI Regulars
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Joined: 21 Feb 2010
Posts: 20

PostPosted: Tue May 20, 2014 4:45 am    Post subject: Re: Bubble deck slab (voided slabs) Reply with quote

nice article on the subject
http://drqaisarali.com/data/lectures/msc%20lectures/Lecture%2010%20Analysis%20and%20Design%20of%20Waffle%20slabs_2011.pdf




kajal.chopra wrote:
Hi,

Does anyone have experience in the analysis and design of bubble deck slabs / voided floor systems?

I'm looking to gather some information for the analysis and design of such floor systems.

Can anyone please help in this regard?
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aakash_jain
SEFI Member
SEFI Member


Joined: 20 Feb 2011
Posts: 11
Location: New York City

PostPosted: Tue May 20, 2014 10:29 pm    Post subject: Re: Bubble deck slab (voided slabs) Reply with quote

kajal.chopra wrote:
Hi,

Does anyone have experience in the analysis and design of bubble deck slabs / voided floor systems?

I'm looking to gather some information for the analysis and design of such floor systems.

Can anyone please help in this regard?



Hi Kajal

Please see the link below:

http://issuu.com/ekagroup/docs/cobiax_engineering_manual_2010_-_version_1_0-2010-

Though the manual is self explanatory, I am writing the steps to make it simpler for you:

Steps:
1.Based on your slab thickness and loads, you can choose the size of your voids (bubbles).
2. Make a finite element model (in SAFE or equivalent) and based on the chosen bubble size, apply property modifiers from the table.
3. Analyze the model and check shear stress contours.
4. In the regions where shear stresses exceed the limits prescribed in the handbook, don't provide the bubbles.
5. Optional value engineering can be done based on your or your senior's judgement, as suggested in the handbook.

A few suggestions:
1. Mark the areas where you do not want voids clearly on drawing with dimensions.
2. Spherical bubbles are more sturdy than flattened ones during pouring.

Good Luck
Aakash
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kajal.chopra
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Joined: 26 Jan 2003
Posts: 102

PostPosted: Thu May 22, 2014 4:03 am    Post subject: Reply with quote

Hi Akash,

Thanks a lot.

Please can you give me your mobile number/email id.

We would like to discuss with you about this about your experience in bubble deck slabs.

BTW, wheer are you put up i.e. where you live/work?

Thanks
Kajal
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Subramanian K
SEFI Member
SEFI Member


Joined: 09 Aug 2012
Posts: 5

PostPosted: Fri May 23, 2014 5:45 am    Post subject: Reply with quote

hi kajal,
i have done a project in the same field voided slab. i've casted and tested 3 nos.  3 * 3 m slab. the project work is tough considering experimental work. if you want you can post your queries to my mail id subramaniancivil39@gmail.com. you can design the slab as a normal with minor alterations.


good luck with your work

regards
subramanian
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satishkemkar
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Joined: 23 Nov 2012
Posts: 20

PostPosted: Mon May 26, 2014 5:16 am    Post subject: Reply with quote

Could any onybody suggest the vendors for manufacturing plastic bubbles for voided slabs in India? we wre looking for this option in one of our project.
My email ID id satishkemkar@gmail.com


Satish Kemkar
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madhav1bhide
SEFI Regulars
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Joined: 21 Feb 2010
Posts: 20

PostPosted: Tue May 27, 2014 4:53 am    Post subject: Reply with quote

see this link

http://www.geoplast.it/eng/casseforme/skydome/
and this link
http://www.metacafe.com/watch/1963208/plastic_waffle_mould_removal/

and this
http://www.turkishexportal.com/Plastic-Formwork-For-Slab-Design_SP8F3E_db4f8089725b4431b72a84281492dbe9

also see
https://www.google.co.in/search?q=plastic+mould+manufacturers+for+waffle+slab+shuttering&rls=com.microsoft:en-US:%7Breferrer:source?%7D&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GIGM_enIN507#cr=countryIN&q=plastic+mould+manufacturers+for+waffle+slab+shuttering&rls=com.microsoft:en-US:%7Breferrer:source%3F%7D&tbs=ctr:countryIN
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